Load and Synchronise Execution of Multiple Scripts using Promises

load-synchronise-execution-multiple-scripts.js

/* load and synchronise execution of 2 or more scripts */
var
	upsuModulesLoaded = [
		RB.Masterpage.LoadResourceFromTenantRoot("_catalogs/masterpage/Buzz365/js/siteusage.js"),
		RB.Masterpage.LoadResourceFromTenantRoot("_catalogs/masterpage/Buzz365/js/userprofile.js")
	];
$.when.apply($, upsuModulesLoaded)
	.done(function() {
		RB.Masterpage.Log("Masterpage>>userprofile.js and siteusage.js have loaded");
		var waitCount = 0;
		function deferAndWaitForModuleExecution() {
			/* this is an edge case:
				while the scripts have been loaded they '**may**' not have executed yet, so we 
				may have to wait for this to happen before we can call the module init functions.
			*/
			if (!RB.Masterpage.IsValidType('RB.Masterpage.Siteusage.EnsureSetup') || !RB.Masterpage.IsValidType('RB.Masterpage.Userprofile.EnsureSetup')) {
				waitCount++;
				if (waitCount > 10) 
					RB.Masterpage.UpSuModulesInitialised.reject(); /* give up after waiting for execution for 2 seconds */
				else {
					RB.Masterpage.Log("Masterpage>>deferAndWaitForModuleExecution("+waitCount+") for USERPROFILE.JS and SITEUSAGE.JS initialisation");
					setTimeout(deferAndWaitForModuleExecution, 200);
				}
				return;
			}
			var moduleInits = [
				RB.Masterpage.Siteusage.EnsureSetup(),
				RB.Masterpage.Userprofile.EnsureSetup()
			];
			$.when.apply($, moduleInits)
				.done(function() {
					RB.Masterpage.UpSuModulesInitialised.resolve();
				});
		}
		deferAndWaitForModuleExecution();
	});
RB.Masterpage.UpSuModulesInitialised
	.done(function() {
		RB.Masterpage.Log("Masterpage>>userprofile.js and siteusage.js have initialised");
		RB.Masterpage.Siteusage.Acceptance();
	});